We have a patio that has 3 big AC compressors within 25 feet. They are very loud and quite annoying. Granted they are all for restaurants so they are bigger than a typical compressor that would be used for a residence. If we had the ability to block installation of these we definitely would have. Personally, I wouldn't let them put it on the roof without getting some monetary compensation.

I have several ductless units & they do work much better at the ground level in a shaded area.Any true professional will advise against putting them on roof or in direct Sun, as they will run constantly & cost you dearly on electric consumption.

Pitfalls: Your roof will leak and everything in your home will be destroyed. The vibration and noise will keep you up at night. You will never be able to enjoy a roof deck up there with a loud AC unit cooling the downstairs neighbors. Compressors should be in the shade in the back of a structure, not on the roof where it's much hotter and they have to work much harder.

if you do agree to let your neighbor put it in (and/or if you put one in yourself), make sure the exhaust points outward, onto the street or back yard.

there's a big A/C compressor on my roof, and the blast of heated exhaust it creates makes half of the roof uninhabitable. I'm a renter, as is the business who installed the A/C. I really wish the landlord had thought of this when giving the go-ahead.

We own the top floor of a small brownstone building, and the roof is deeded to us - we have the right to build a deck there (with condo assoc approval). Currently, there's nothing on the roof, and it is 100% maintained by the condo assoc.

A downstairs neighbor is looking into installing ductless AC and may need to put a compressor on the roof - which is deeded to us.

This is new to us, and we're wondering if anyone can provide insight into a situation like this?

- Any reasons for allowing this (besides good neighbor relations)?

- Any reasons to not allow this?

- Pitfalls?

- if we allow this, what do we need (and ask for from the neighbor) to make sure we are protected - from a legal and monetary perspective?

We assume we will need to get a lawyer to get all responsibilities written down on paper, and signed if we go ahead with the neighbor?

Thank you in advance for any feedback!

PS also want to note that we may, or may not, also install a separate ductless AC unit along with the neighbor. We are in the "exploratory" stage and just got a contractor here for the initial visit together. Still haven't decided if it is a "go" for us or not.